trace: Remove unused workqueue tracer
This tracer was temporarily removed in 6416669
(workqueue:
temporarily remove workqueue tracing, 2010-06-29) but never
reinstated after concurrency managed workqueues were completed.
For almost two years it hasn't been compilable so it seems nobody
is using it. Delete it.
Signed-off-by: Stephen Boyd <sboyd@codeaurora.org>
Acked-by: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
parent
923e9a1399
commit
d3283fb45c
|
@ -41,7 +41,6 @@ obj-$(CONFIG_STACK_TRACER) += trace_stack.o
|
||||||
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
|
obj-$(CONFIG_MMIOTRACE) += trace_mmiotrace.o
|
||||||
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
|
obj-$(CONFIG_FUNCTION_GRAPH_TRACER) += trace_functions_graph.o
|
||||||
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
|
obj-$(CONFIG_TRACE_BRANCH_PROFILING) += trace_branch.o
|
||||||
obj-$(CONFIG_WORKQUEUE_TRACER) += trace_workqueue.o
|
|
||||||
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
|
obj-$(CONFIG_BLK_DEV_IO_TRACE) += blktrace.o
|
||||||
ifeq ($(CONFIG_BLOCK),y)
|
ifeq ($(CONFIG_BLOCK),y)
|
||||||
obj-$(CONFIG_EVENT_TRACING) += blktrace.o
|
obj-$(CONFIG_EVENT_TRACING) += blktrace.o
|
||||||
|
|
|
@ -1,300 +0,0 @@
|
||||||
/*
|
|
||||||
* Workqueue statistical tracer.
|
|
||||||
*
|
|
||||||
* Copyright (C) 2008 Frederic Weisbecker <fweisbec@gmail.com>
|
|
||||||
*
|
|
||||||
*/
|
|
||||||
|
|
||||||
|
|
||||||
#include <trace/events/workqueue.h>
|
|
||||||
#include <linux/list.h>
|
|
||||||
#include <linux/percpu.h>
|
|
||||||
#include <linux/slab.h>
|
|
||||||
#include <linux/kref.h>
|
|
||||||
#include "trace_stat.h"
|
|
||||||
#include "trace.h"
|
|
||||||
|
|
||||||
|
|
||||||
/* A cpu workqueue thread */
|
|
||||||
struct cpu_workqueue_stats {
|
|
||||||
struct list_head list;
|
|
||||||
struct kref kref;
|
|
||||||
int cpu;
|
|
||||||
pid_t pid;
|
|
||||||
/* Can be inserted from interrupt or user context, need to be atomic */
|
|
||||||
atomic_t inserted;
|
|
||||||
/*
|
|
||||||
* Don't need to be atomic, works are serialized in a single workqueue thread
|
|
||||||
* on a single CPU.
|
|
||||||
*/
|
|
||||||
unsigned int executed;
|
|
||||||
};
|
|
||||||
|
|
||||||
/* List of workqueue threads on one cpu */
|
|
||||||
struct workqueue_global_stats {
|
|
||||||
struct list_head list;
|
|
||||||
spinlock_t lock;
|
|
||||||
};
|
|
||||||
|
|
||||||
/* Don't need a global lock because allocated before the workqueues, and
|
|
||||||
* never freed.
|
|
||||||
*/
|
|
||||||
static DEFINE_PER_CPU(struct workqueue_global_stats, all_workqueue_stat);
|
|
||||||
#define workqueue_cpu_stat(cpu) (&per_cpu(all_workqueue_stat, cpu))
|
|
||||||
|
|
||||||
static void cpu_workqueue_stat_free(struct kref *kref)
|
|
||||||
{
|
|
||||||
kfree(container_of(kref, struct cpu_workqueue_stats, kref));
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Insertion of a work */
|
|
||||||
static void
|
|
||||||
probe_workqueue_insertion(void *ignore,
|
|
||||||
struct task_struct *wq_thread,
|
|
||||||
struct work_struct *work)
|
|
||||||
{
|
|
||||||
int cpu = cpumask_first(&wq_thread->cpus_allowed);
|
|
||||||
struct cpu_workqueue_stats *node;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
|
|
||||||
if (node->pid == wq_thread->pid) {
|
|
||||||
atomic_inc(&node->inserted);
|
|
||||||
goto found;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
pr_debug("trace_workqueue: entry not found\n");
|
|
||||||
found:
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Execution of a work */
|
|
||||||
static void
|
|
||||||
probe_workqueue_execution(void *ignore,
|
|
||||||
struct task_struct *wq_thread,
|
|
||||||
struct work_struct *work)
|
|
||||||
{
|
|
||||||
int cpu = cpumask_first(&wq_thread->cpus_allowed);
|
|
||||||
struct cpu_workqueue_stats *node;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
list_for_each_entry(node, &workqueue_cpu_stat(cpu)->list, list) {
|
|
||||||
if (node->pid == wq_thread->pid) {
|
|
||||||
node->executed++;
|
|
||||||
goto found;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
pr_debug("trace_workqueue: entry not found\n");
|
|
||||||
found:
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Creation of a cpu workqueue thread */
|
|
||||||
static void probe_workqueue_creation(void *ignore,
|
|
||||||
struct task_struct *wq_thread, int cpu)
|
|
||||||
{
|
|
||||||
struct cpu_workqueue_stats *cws;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
WARN_ON(cpu < 0);
|
|
||||||
|
|
||||||
/* Workqueues are sometimes created in atomic context */
|
|
||||||
cws = kzalloc(sizeof(struct cpu_workqueue_stats), GFP_ATOMIC);
|
|
||||||
if (!cws) {
|
|
||||||
pr_warning("trace_workqueue: not enough memory\n");
|
|
||||||
return;
|
|
||||||
}
|
|
||||||
INIT_LIST_HEAD(&cws->list);
|
|
||||||
kref_init(&cws->kref);
|
|
||||||
cws->cpu = cpu;
|
|
||||||
cws->pid = wq_thread->pid;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
list_add_tail(&cws->list, &workqueue_cpu_stat(cpu)->list);
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
}
|
|
||||||
|
|
||||||
/* Destruction of a cpu workqueue thread */
|
|
||||||
static void
|
|
||||||
probe_workqueue_destruction(void *ignore, struct task_struct *wq_thread)
|
|
||||||
{
|
|
||||||
/* Workqueue only execute on one cpu */
|
|
||||||
int cpu = cpumask_first(&wq_thread->cpus_allowed);
|
|
||||||
struct cpu_workqueue_stats *node, *next;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
list_for_each_entry_safe(node, next, &workqueue_cpu_stat(cpu)->list,
|
|
||||||
list) {
|
|
||||||
if (node->pid == wq_thread->pid) {
|
|
||||||
list_del(&node->list);
|
|
||||||
kref_put(&node->kref, cpu_workqueue_stat_free);
|
|
||||||
goto found;
|
|
||||||
}
|
|
||||||
}
|
|
||||||
|
|
||||||
pr_debug("trace_workqueue: don't find workqueue to destroy\n");
|
|
||||||
found:
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
|
|
||||||
}
|
|
||||||
|
|
||||||
static struct cpu_workqueue_stats *workqueue_stat_start_cpu(int cpu)
|
|
||||||
{
|
|
||||||
unsigned long flags;
|
|
||||||
struct cpu_workqueue_stats *ret = NULL;
|
|
||||||
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
|
|
||||||
if (!list_empty(&workqueue_cpu_stat(cpu)->list)) {
|
|
||||||
ret = list_entry(workqueue_cpu_stat(cpu)->list.next,
|
|
||||||
struct cpu_workqueue_stats, list);
|
|
||||||
kref_get(&ret->kref);
|
|
||||||
}
|
|
||||||
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void *workqueue_stat_start(struct tracer_stat *trace)
|
|
||||||
{
|
|
||||||
int cpu;
|
|
||||||
void *ret = NULL;
|
|
||||||
|
|
||||||
for_each_possible_cpu(cpu) {
|
|
||||||
ret = workqueue_stat_start_cpu(cpu);
|
|
||||||
if (ret)
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
return NULL;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void *workqueue_stat_next(void *prev, int idx)
|
|
||||||
{
|
|
||||||
struct cpu_workqueue_stats *prev_cws = prev;
|
|
||||||
struct cpu_workqueue_stats *ret;
|
|
||||||
int cpu = prev_cws->cpu;
|
|
||||||
unsigned long flags;
|
|
||||||
|
|
||||||
spin_lock_irqsave(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
if (list_is_last(&prev_cws->list, &workqueue_cpu_stat(cpu)->list)) {
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
do {
|
|
||||||
cpu = cpumask_next(cpu, cpu_possible_mask);
|
|
||||||
if (cpu >= nr_cpu_ids)
|
|
||||||
return NULL;
|
|
||||||
} while (!(ret = workqueue_stat_start_cpu(cpu)));
|
|
||||||
return ret;
|
|
||||||
} else {
|
|
||||||
ret = list_entry(prev_cws->list.next,
|
|
||||||
struct cpu_workqueue_stats, list);
|
|
||||||
kref_get(&ret->kref);
|
|
||||||
}
|
|
||||||
spin_unlock_irqrestore(&workqueue_cpu_stat(cpu)->lock, flags);
|
|
||||||
|
|
||||||
return ret;
|
|
||||||
}
|
|
||||||
|
|
||||||
static int workqueue_stat_show(struct seq_file *s, void *p)
|
|
||||||
{
|
|
||||||
struct cpu_workqueue_stats *cws = p;
|
|
||||||
struct pid *pid;
|
|
||||||
struct task_struct *tsk;
|
|
||||||
|
|
||||||
pid = find_get_pid(cws->pid);
|
|
||||||
if (pid) {
|
|
||||||
tsk = get_pid_task(pid, PIDTYPE_PID);
|
|
||||||
if (tsk) {
|
|
||||||
seq_printf(s, "%3d %6d %6u %s\n", cws->cpu,
|
|
||||||
atomic_read(&cws->inserted), cws->executed,
|
|
||||||
tsk->comm);
|
|
||||||
put_task_struct(tsk);
|
|
||||||
}
|
|
||||||
put_pid(pid);
|
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
static void workqueue_stat_release(void *stat)
|
|
||||||
{
|
|
||||||
struct cpu_workqueue_stats *node = stat;
|
|
||||||
|
|
||||||
kref_put(&node->kref, cpu_workqueue_stat_free);
|
|
||||||
}
|
|
||||||
|
|
||||||
static int workqueue_stat_headers(struct seq_file *s)
|
|
||||||
{
|
|
||||||
seq_printf(s, "# CPU INSERTED EXECUTED NAME\n");
|
|
||||||
seq_printf(s, "# | | | |\n");
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
|
|
||||||
struct tracer_stat workqueue_stats __read_mostly = {
|
|
||||||
.name = "workqueues",
|
|
||||||
.stat_start = workqueue_stat_start,
|
|
||||||
.stat_next = workqueue_stat_next,
|
|
||||||
.stat_show = workqueue_stat_show,
|
|
||||||
.stat_release = workqueue_stat_release,
|
|
||||||
.stat_headers = workqueue_stat_headers
|
|
||||||
};
|
|
||||||
|
|
||||||
|
|
||||||
int __init stat_workqueue_init(void)
|
|
||||||
{
|
|
||||||
if (register_stat_tracer(&workqueue_stats)) {
|
|
||||||
pr_warning("Unable to register workqueue stat tracer\n");
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
}
|
|
||||||
fs_initcall(stat_workqueue_init);
|
|
||||||
|
|
||||||
/*
|
|
||||||
* Workqueues are created very early, just after pre-smp initcalls.
|
|
||||||
* So we must register our tracepoints at this stage.
|
|
||||||
*/
|
|
||||||
int __init trace_workqueue_early_init(void)
|
|
||||||
{
|
|
||||||
int ret, cpu;
|
|
||||||
|
|
||||||
for_each_possible_cpu(cpu) {
|
|
||||||
spin_lock_init(&workqueue_cpu_stat(cpu)->lock);
|
|
||||||
INIT_LIST_HEAD(&workqueue_cpu_stat(cpu)->list);
|
|
||||||
}
|
|
||||||
|
|
||||||
ret = register_trace_workqueue_insertion(probe_workqueue_insertion, NULL);
|
|
||||||
if (ret)
|
|
||||||
goto out;
|
|
||||||
|
|
||||||
ret = register_trace_workqueue_execution(probe_workqueue_execution, NULL);
|
|
||||||
if (ret)
|
|
||||||
goto no_insertion;
|
|
||||||
|
|
||||||
ret = register_trace_workqueue_creation(probe_workqueue_creation, NULL);
|
|
||||||
if (ret)
|
|
||||||
goto no_execution;
|
|
||||||
|
|
||||||
ret = register_trace_workqueue_destruction(probe_workqueue_destruction, NULL);
|
|
||||||
if (ret)
|
|
||||||
goto no_creation;
|
|
||||||
|
|
||||||
return 0;
|
|
||||||
|
|
||||||
no_creation:
|
|
||||||
unregister_trace_workqueue_creation(probe_workqueue_creation, NULL);
|
|
||||||
no_execution:
|
|
||||||
unregister_trace_workqueue_execution(probe_workqueue_execution, NULL);
|
|
||||||
no_insertion:
|
|
||||||
unregister_trace_workqueue_insertion(probe_workqueue_insertion, NULL);
|
|
||||||
out:
|
|
||||||
pr_warning("trace_workqueue: unable to trace workqueues\n");
|
|
||||||
|
|
||||||
return 1;
|
|
||||||
}
|
|
||||||
early_initcall(trace_workqueue_early_init);
|
|
Loading…
Reference in New Issue